HiTBiT Assembly

THIS IS FROM DESERT STORM DAYS, BUT IT HAS NOTHING TO DO WITH DESERT STORM.

here is a related publication.
http://boiling.seas.ucla.edu/BOILING/Publications/Conf_LMWD2003

ABSTRACT

Phase change heat transfer phenomena have been discovered with a micron-sized heat transfer element operating in subcooled (20oC) degassed, de-ionized water over a wide pressure range (200 – 6000 Psia) at ultra-high heat fluxes up to 4000 W/cm2. The platinum heat transfer element (diameter 7.5 microns, length 1.14 mm) is mounted horizontally within a 0.6 cm internal diameter stainless steel tube. The platinum element is simultaneously a resistance thermometer. Sealed electrical terminals effect direct current heating of the platinum element. Pressure is applied pneumatically. The adiabatic heating rate of the element is 6 oC per microsecond at 3700 W/cm2; therefore, response is essentially instantaneous for the procedures described herein. Two distinct procedures have been employed. In the first procedure, power (heat flux) is maintained substantially constant as pressure is reduced. In the second procedure, pressure is held constant while the heat flux is increased smoothly,

The first procedure: 1) Pressurize the water-filled stainless steel chamber to 6000 Psia 2) Apply substantially constant power (fixed heat flux). 3) Maintain constant heat flux as pressure is reduced smoothly from 6000 Psia to 200 Psia over a period of about 20 seconds. Record voltage, amperage, and pressure at 0.1 second intervals.

The second (Nukiyama) procedure: 1) Pressurize the water-filled stainless steel chamber to a fixed pressure. 2) Apply smoothly increasing power. 3) Maintain constant pressure while the heat flux is increased from very low values to several thousand W/cm2. Record voltage, amperage, and pressure at 0.1 second intervals.

The test results reveal a very high level of consistency among sets of runs conducted by INZ and more recent runs conducted by the Boiling Heat Transfer Laboratory at UCLA.